taityou ga mada modotte inai node, kyou ha ie de yasumimasu.

体調 means physical condition, health condition, or how your body is feeling.

In this sentence, it refers to the speaker’s physical state overall, not just one symptom. It is a very common word when talking about feeling sick, recovering, or not being at 100%.

For example:

• 体調が悪い = my physical condition is bad / I’m not feeling well
• 体調が戻る = my condition returns / I recover

が marks 体調 as the thing being described by the predicate まだ戻っていない.

So the structure is basically:

• 体調が = as for my physical condition / my physical condition
• まだ戻っていない = has not returned yet

Japanese often uses が with verbs or expressions that describe a state or change, especially when focusing on what is in that state.

Here, 体調が戻る is a natural set phrase meaning one’s condition returns / one recovers.

With a negative verb, まだ means not yet.

So:

• まだ戻っていない = has not returned yet / has not recovered yet

This is an important pattern:

• まだ + negative = not yet
• もう + affirmative = already

Examples:

• まだ食べていない = I haven’t eaten yet
• もう食べた = I already ate

So in this sentence, まだ shows that recovery is expected, but it has not happened yet.

戻っていない means has not returned or is not back yet, which fits the idea of a state that should have changed by now but hasn’t.

By contrast, 戻らない often sounds more like:

• does not return
• will not return
• is not returning

That can sound more general or less connected to a present resulting state.

Here, the speaker means:

• their condition was bad
• it is supposed to improve and return to normal
• that recovery has not happened yet

So 戻っていない is the natural choice.

ている does not only mean an action in progress. It can also show a resulting state.

With some verbs, especially change-of-state verbs like 戻る, 結婚する, 死ぬ, 開く, 壊れる, the ている form often describes the state after the change.

So:

• 戻る = to return
• 戻っている = has returned / is back
• 戻っていない = has not returned / is not back

In this sentence, the idea is not my condition is in the middle of returning. It is my condition is not back yet.

戻る literally means to return, to go back, or to come back.

In this sentence, it is used figuratively:

• 体調が戻る = one’s physical condition returns
• natural English meaning: to recover or to get back to normal

So even though the Japanese uses the idea of returning, the best English translation is often I haven’t recovered yet.

Both ので and から can mean because, but ので usually sounds:

• a bit softer
• a bit more formal
• a bit more explanatory

So:

• 体調がまだ戻っていないので = because I still haven’t recovered

Compared with から, ので often feels less direct and more polite in tone. Since the sentence ends with the polite form 休みます, ので matches the overall tone well.

Very roughly:

• から = because, often more direct/personal
• ので = because/since, often softer and more explanatory

は marks 今日 as the topic: as for today or today, ...

So:

• 今日は = today / as for today

This sets the time frame for what follows:

• 今日は家で休みます = today I’ll rest at home

Using 今日が would sound unnatural here, because the speaker is not emphasizing today as the grammatical subject. They are just setting today as the topic of the sentence.

Because で marks the place where an action happens.

Here, the action is:

• 休みます = rest

So:

• 家で休みます = rest at home

Compare:

• 家に行きます = go home
  
  • に marks destination
• 家で休みます = rest at home
  
  • で marks location of action

Since resting is something done at a place, で is the correct particle.

Here, 休みます means to rest.

So:

• 家で休みます = I’ll rest at home

Depending on context, 休む / 休みます can also mean:

• to take a break
• to take a day off
• to be absent
• to sleep/rest

In this sentence, it most naturally means the speaker will stay home and rest because they are not fully recovered.

Japanese often leaves out the subject when it is clear from context.

In this sentence, it is obvious that the speaker is talking about their own condition and their own plan:

• 体調がまだ戻っていない = my condition hasn’t recovered yet
• 今日は家で休みます = I’ll rest at home today

So Japanese does not need to say 私は unless there is a reason to emphasize I.

This is very common in natural Japanese.

Yes, that is completely normal.

Before ので, Japanese often uses the plain form:

• 戻っていないので

Then the main sentence can end politely:

• 休みます

So the pattern is:

• subordinate clause in plain form
• main clause in polite form

This is extremely common and natural.

If everything were made fully polite, it would sound heavier:

• 体調がまだ戻っていませんので、今日は家で休みます。

That is also correct, but the original sentence is very natural and balanced.

The sentence breaks down like this:

• 体調が = my physical condition
• まだ = still / not yet
• 戻っていない = has not returned / has not recovered
• ので = because
• 今日は = as for today / today
• 家で = at home
• 休みます = will rest

So the structure is:

[reason] + ので + [main action]

That is a very common Japanese pattern:

• Aので、B
• Because A, B

Here:

• 体調がまだ戻っていないので、今日は家で休みます。
• Because I haven’t recovered yet, I’ll rest at home today.

Yes, depending on context, it can suggest that too.

The core meaning is:

• the speaker has not fully recovered
• so they will stay home and rest today

In a work or school context, listeners may naturally understand:

• I’m taking today off and resting at home

But the Japanese sentence itself does not explicitly say from work or from school. It simply says I will rest at home today. Context decides whether it also implies taking the day off.